101232

Appears in sequences

• Quadrinomial coefficients: C(2+n,n) + C(3+n,n) + C(4+n,n).at n=36A005718
• Positive numbers k such that k and 3*k are anagrams in base 4 (written in base 4).at n=13A023060
• Lexicographically earliest increasing sequence with property that in the concatenation of its terms every pair of consecutive digits differs by 1.at n=20A098766
• Molecular topological indices of the cocktail party graphs.at n=18A181773
• a(n) = Sum_{0 < x,y,z <= n and gcd(x^2 + y^2 + z^2, n)=1} gcd(x^2 + y^2 + z^2 - 1, n).at n=37A239612
• Number of tilings of a 5 X n rectangle using n pentominoes of shapes Y, U, X.at n=26A247268
• a(n) is the number of 2 X 2 matrices over Z_p with determinant in {1,-1} where p = prime(n).at n=11A262354
• Number of orthogonal 3 X 3 matrices over the ring Z/nZ.at n=36A264083
• a(n) = smallest k such that the digits of exactly n nonnegative numbers are a subsequence of the digits of k.at n=34A275782
• Number of 2 X 2 matrices with entries in {0,1,...,n} with determinant = permanent with no entries repeated.at n=38A280058
• Triangle T(n,k), n>=1, 0 <= k <= A002620(n-1), read by rows, where T(n,k) is the number of self-avoiding paths of length 2*(n+k) along the edges of a grid with n X n square cells, which do not pass above the diagonal, start at the lower left corner and finish at the upper right corner.at n=32A340043